Location of Urban Logistics Spaces (ULS) for Two-Echelon Distribution Systems

Flexible Two-Echelon Location Routing

A Multilayer Variable Neighborhood Search Method for a Two-Echelon Adaptive Location-Distribution Problem

We consider a location-distribution problem motivated by a case study for a multi-channel retailing company, which sells a wide variety of products via Internet, mail order catalogs, and stores. Since most items to deliver are small or medium-size parcels, consolidation is a major concern which is addressed by designing a multi-echelon distribution system. This system is adaptive, in the sense ...

Formulations, Bounds and Heuristic Methods for a Two-Echelon Adaptive Location-Distribution Problem

We consider a two-echelon location-distribution problem arising from an actual application in fast delivery service. This problem belongs to the class of adaptive logistics problems, as the locations of the facilities (typically, parking spaces) are revised on a daily basis according to demand variations. We present and compare two formulations for this problem: an arc-based model and a path-ba...

Tabu Search Heuristic for a Two- Echelon Location-Routing Problem

In this paper we tackle a two-echelon location-routing problem (2E-LRP) by a tabu search metaheuristic. The aim is to define the location and number of two kinds of capacitated facilities, the size of two different vehicle fleets and the related routes on each echelon. The proposed Tabu Search (TS) for the 2E-LRP is based on the decomposition of the problem in two location-routing sub-problems,...

Echelon Spaces of Order »

The notion of Echelon spaces was introduced by Köthe [2] as a means of constructing sequence spaces by taking the intersection of multiples of I1 (see below for definitions). The definition was extended by Dieudonné and Gomes [l] to include lp for \^p< °o. It is the purpose of this note to consider the case, p = co. AH of the terminology defined below is due to Köthe. A sequence of complex numb...